Carbothermal Preparation of Ultra-Fine TiB2 Powders Using Solution-Derived Precursors via Sol-Gel Method
Ultra-fine titanium diboride (TiB2) powders have been prepared by carbothermal reduction reactions in TiO2-B2O3-C system using tetrabutyl titanate, boric acid and phenolic resin as the solution-derived precursors. The reactions were substantially completed at relatively lower temperature (<1400°C) and the resulting products had a smaller average crystallite size (< 200 nm). However, below 1100°C, titanium carbide was the predominant phase and the relative content decreased with the rise of temperature. The thermodynamic change in TiO2-B2O3-C system was mainly studied by TG-DTA and the mechanism of synthesis of TiB2 was discussed. The crystallite size and morphology of the synthesized powders were characterized by SEM and TEM.
Wei Pan and Jianghong Gong
Y. J. Yan et al., "Carbothermal Preparation of Ultra-Fine TiB2 Powders Using Solution-Derived Precursors via Sol-Gel Method", Key Engineering Materials, Vols. 336-338, pp. 944-947, 2007